How hearing aids work
There are five main components of a hearing aid. The first is a microphone, which picks up the sound from the surroundings. This gets converted to an electrical signal, which gets sent to the amplifier. The amplifier increases the volume of this signal and sends it to the receiver. This receiver, or speaker, converts the electrical signal into sound again and sends the sound into the ear, which then get sent to the brain. The last part is the battery, which provides the energy for the aid to function.
The microchip allows for the hearing aids to be programmed and customized to your specific hearing loss needs.
Hearing aids still rely on the hair cells in the cochlea to convert the sound into nerve signals, so it is still important that there are hair cells in the ear otherwise the hearing aid won’t be effective.
(Watson, S. (n.d.). Discovery Health "Hearing Aid Parts". Discovery Health "Discovery Fit & Health". Retrieved July 10, 2013, from http://health.howstuffworks.com/medicine/modern-technology/hearing-aid1.htm)